若x+y=8,x2y2=4,则x2+y2=______.
已知实数x,y满足x2+y2=2x,则x2y2的取值范围是______.
y2+x2=2x,则x2y2的范围?
已知x-y=3,x2+y2=13,求x3y-8x2y2+xy3的值.
已知x+y=4,x2+y2=14,求x3y-2x2y2+xy3的值.
已知x2+4y2+x2y2-6xy+1=0,求 x4-y4/2x-y 乘 2xy-y2/xy-y2 除以(x2+y2/x
已知x2+4x+y2-2y+5=0,则x2+y2=______.
化简求值(2X2-2y2)-3(X2y2+X2)+3(X2y2+y2),其中X=-1,y=2
已知(x2+4y2)2-16x2y2=0,且x≠2y.请用含x的代数式表示y.
已知x+y=5,x2+y2=13,求代数式x3y+2x2y2+xy3的值.
已知x2+y2-4x-10y+29=0求x2y2+2x3y2+x4y2的值
若实数x,y满足3x2+2y2=6x,则x2+y2的最大值为______.
若x2-4x+y2+6y+13=0,则x=______,y=______.